The maximum comfortable retardation applied to moving vehicles, is

- 1
  
  $3.42 m / s e c^{2}$
- 2
  
  $4.42 m / s e c^{2}$
- 3
  
  $5.56 m / s e c^{2}$
- 4
  
  $7.80 m / s e c^{2}$

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